Update doc/api/crypto.md

Co-authored-by: Antoine du Hamel <[email protected]>

Author: Semigradsky

doc/api/crypto.md

@@ -570,7 +570,7 @@ added: v1.0.0
 * `options` {Object} [`stream.transform` options][]
   * `plaintextLength` {number}
   * `encoding` {string} The string encoding to use when `buffer` is a string.
-* Returns: {Cipher} A Cipher for method chaining.
+* Returns: {Cipher} The same `Cipher` instance for method chaining.
 
 When using an authenticated encryption mode (`GCM`, `CCM`, `OCB`, and
 `chacha20-poly1305` are